If it's intermittent better rule out the TPS and replace it
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If it's intermittent better rule out the TPS and replace it
Where is the TPU found? Please.
It's attached to the pedal, it comes together with it
Hi worane,
4,7 is a driver demand supply voltage logged high fault.
That means that the voltage supplied by the ECU to the throttle position sensor is higher than maximum allowable.
As far as I'm aware the throttle position sensor can't increase the voltage above supply, even if it's faulty.
For a start I'd get out the multimeter and check what voltage is on the TPS supply wire at the ECU.
It should be 5000mV +/- maybe 10 to 20mV, yours will be higher.
You'll need to back probe the connector - you can use a pin or paper clip at a pinch.
Once you've checked with the ECU connected, unplug the ECU connector (with ignition off) turn the ignition on and check the voltage on the TPS supply again. If it's not 0 mV you will need to check the harness.
Does this mean the the ECU is looking for a device attached but is not seeing one? The voltage isnt actually "high" but its higher than it would be if there were a device plugged into it?Quote:
Originally Posted by OffTrack
Indicating either a break in the harness, the pedal is unplugged, or it is failing internally?
Thanks Offtrack.
Do you happen to know which plug pin I have to go for in the ECU?
I have been wading through the rav wiring But haven't a clue what I am doing in there. I knew I should have paid attention in electrical classes in the RN.
Also I have pulled the oil cooler plug and find two wires one white and a black wire that only goes halfway around the back of the engine. It does not seem to have the other half of the black wire going into the conduit under the FPR. Is this correct?
Also when I turn on the ignition and have the gear shift lever in 12or3 I get a very brief red light on the base of the lever the it reverts to D and lights that up.After starting the car I have NO lights showing on 12 or 3 positions.
I am beginning to think a Nissan is starting to look good. Trouble is the amount of dollars I have poured into this thing!
No. It indicates the supply voltage is above expected range.Quote:
Originally Posted by CU55TM Disco
On the bench with nothing plugged in except ground and 12V this is what I get on the Nanocom:
Track 1: 5mV
Track 2: 4999mV
Track 3: 5000mV
TPS Supply 5010mV
Faults:
1, 5 Driver Demand Problem 1, (logged low)
5, 5 Driver Demand Problem 1 (current)
21,4 Driver Demand 1 Out of Range (logged)
21,5 Driver Demand 2 Out of Range (logged)
21,6 Problems Detected with Driver Demand (logged)
25,4 Driver Demand 1 Out of Range (Logged)
25,5 Driver Demand 2 Out of Range (Logged)
25,6 Problems Detected with Driver Demand (logged)
The faults in the 1,x -> 8,x range are Analog to Digital conversion range check faults.
These indicate the sensor voltage is either too high or two low.
The others are usually range checks that occur later in processing.
So no, an open circuit won't cause a "logged high" fault in the TPS Supply.
Something is pulling the line voltage above the expected maximum.
The single black wire is fine, and I think most D2's are like that. The oil pressure switch is grounded through the block.Quote:
Originally Posted by worane
What you need to measure is B14 on the Black Plug - circled below.
Check the PDF attached. Note diagrams shown are looking into the connector - from the back of the plug you need to reverse.
Attachment 150025
You won't be able to test by removing the connector as the black plug has the main 12V supplies and grounds.
I spend most of my time looking at the code rather than the hardware, or at least that is my excuse ;)
My theory(might not be correct) is that it's a wrong terminology as that fault code refers to ''supply" while it's about T1+T2 return which is named ''supply" in the fault code as it's supposed to be equal with the reference feed(supplied by ECU)... the ECU is comparing the supply(delivered reference feed which is constant) with the return sum of T1 and T2 and there is a limit for the difference between T1 +T2 and the reference supply(i dont know how much) which if it's exceeded it logs that ''supply high'' fault code. I compared many logs and while it's logical that the TPS can't amplify the supply though if you have logs saved make some calculations and you'll see that T1 +T2 is always a bit greater than the reference supply and the difference grows as the pedal is more depressed... so if the voltage drop on one of the potentiometers(T1 or T2) is lower than what's normal then the sum will be higher e.g a short in one of the pots will return higher voltage then T1 +T2 exceeds that(unknown by me) limit and that "supply high" code is logged....
@worane IMO don't torment yourself with complicated measurements, better replace the TPS with a known good one cos if it's inefficient to chase other issues untill the TPS is not ruled out as it's a quite common failure.
Thanks Sierrafery, I like the way you think! I have another pedal I can put in.
